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Profit and Loss

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Aptitude miscellaneous
  1. If I purchased 11 books for Rs. 10 and sold all the books at the rate of 10 books for Rs. 11, the profit per cent is ?
    1. 10%
    2. 11%
    3. 21%
    4. 100%
Correct Option: C

Suppose I purchased 110 books
∵ C.P. = Rs. (10/11) x 110 = Rs. 100
⇒ S.P. = Rs. (11/10) x 110 = Rs. 121
∴ Gain % = 21%


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